system: Allow separated /boot and encrypted root.

* gnu/bootloader/grub.scm (grub-configuration-file): New parameter
store-crypto-devices.
[crypto-devices]: New helper function.
[builder]: Use crypto-devices.
* gnu/machine/ssh.scm (roll-back-managed-host): Use
boot-parameters-store-crypto-devices to provide its contents to the
bootloader configuration generation process.
* gnu/tests/install.scm (%encrypted-root-not-boot-os,
%encrypted-root-not-boot-os): New os declaration.
(%encrypted-root-not-boot-installation-script): New script, whose contents
were initially taken from %encrypted-root-installation-script.
(%test-encrypted-root-not-boot-os): New test.
* gnu/system.scm (define-module): Export
operating-system-bootoader-crypto-devices and
boot-parameters-store-crypto-devices.
(<boot-parameters>): Add field store-crypto-devices.
(read-boot-parameters): Parse store-crypto-devices field.
[uuid-sexp->uuid]: New helper function extracted from
device-sexp->device.
(operating-system-bootloader-crypto-devices): New function.
(operating-system-bootcfg): Use
operating-system-bootloader-crypto-devices to provide its contents to
the bootloader configuration generation process.
(operating-system-boot-parameters): Add store-crypto-devices to the
generated boot-parameters.
(operating-system-boot-parameters-file): Likewise to the file with
the serialized structure.
* guix/scripts/system.scm (reinstall-bootloader): Use
boot-parameters-store-crypto-devices to provide its contents to the
bootloader configuration generation process.
* tests/boot-parameters.scm (%default-store-crypto-devices): New
variable.
(%grub-boot-parameters, test-read-boot-parameters): Use
%default-store-crypto-devices.
(tests store-crypto-devices): New tests.

4 files changed, 182 insertions, 3 deletions

diff --git a/gnu/bootloader/grub.scm b/gnu/bootloader/grub.scm
index af7b7561ff..29c81ae641 100644
--- a/gnu/bootloader/grub.scm
+++ b/gnu/bootloader/grub.scm
@@ -4,7 +4,7 @@
 ;;; Copyright © 2017 Leo Famulari <leo@famulari.name>
 ;;; Copyright © 2017, 2020 Mathieu Othacehe <m.othacehe@gmail.com>
 ;;; Copyright © 2019, 2020 Jan (janneke) Nieuwenhuizen <janneke@gnu.org>
-;;; Copyright © 2019 Miguel Ángel Arruga Vivas <rosen644835@gmail.com>
+;;; Copyright © 2019, 2020 Miguel Ángel Arruga Vivas <rosen644835@gmail.com>
 ;;; Copyright © 2020 Maxim Cournoyer <maxim.cournoyer@gmail.com>
 ;;; Copyright © 2020 Stefan <stefan-guix@vodafonemail.de>
 ;;;
@@ -359,11 +359,14 @@ code."
                                   (locale #f)
                                   (system (%current-system))
                                   (old-entries '())
+                                  (store-crypto-devices '())
                                   store-directory-prefix)
   "Return the GRUB configuration file corresponding to CONFIG, a
 <bootloader-configuration> object, and where the store is available at
 STORE-FS, a <file-system> object.  OLD-ENTRIES is taken to be a list of menu
 entries corresponding to old generations of the system.
+STORE-CRYPTO-DEVICES contain the UUIDs of the encrypted units that must
+be unlocked to access the store contents.
 STORE-DIRECTORY-PREFIX may be used to specify a store prefix, as is required
 when booting a root file system on a Btrfs subvolume."
   (define all-entries
@@ -411,6 +414,21 @@ menuentry ~s {
                   (string-join (map string-join '#$modules)
                                "\n  module " 'prefix))))))
 
+  (define (crypto-devices)
+    (define (crypto-device->cryptomount dev)
+      (if (uuid? dev)
+          #~(format port "cryptomount -u ~a~%"
+                    ;; cryptomount only accepts UUID without the hypen.
+                    #$(string-delete #\- (uuid->string dev)))
+          ;; Other type of devices aren't implemented.
+          #~()))
+    (let ((devices (map crypto-device->cryptomount store-crypto-devices))
+          ;; XXX: Add luks2 when grub 2.06 is packaged.
+          (modules #~(format port "insmod luks~%")))
+      (if (null? devices)
+          devices
+          (cons modules devices))))
+
   (define (sugar)
     (let* ((entry (first all-entries))
            (device (menu-entry-device entry))
@@ -474,6 +492,7 @@ keymap ~a~%" #$keymap))))
                   "# This file was generated from your Guix configuration.  Any changes
 # will be lost upon reconfiguration.
 ")
+          #$@(crypto-devices)
           #$(sugar)
           #$locale-config
           #$keyboard-layout-config
diff --git a/gnu/machine/ssh.scm b/gnu/machine/ssh.scm
index 1b748c8da7..08c653ba17 100644
--- a/gnu/machine/ssh.scm
+++ b/gnu/machine/ssh.scm
@@ -484,6 +484,8 @@ an environment type of 'managed-host."
                                         (list (second boot-parameters))))
                        (locale -> (boot-parameters-locale
                                    (second boot-parameters)))
+                       (crypto-dev -> (boot-parameters-store-crypto-devices
+                                       (second boot-parameters)))
                        (store-dir -> (boot-parameters-store-directory-prefix
                                       (second boot-parameters)))
                        (old-entries -> (map boot-parameters->menu-entry
@@ -496,6 +498,7 @@ an environment type of 'managed-host."
                                     bootloader))
                                   bootloader entries
                                   #:locale locale
+                                  #:store-crypto-devices crypto-dev
                                   #:store-directory-prefix store-dir
                                   #:old-entries old-entries)))
                        (remote-result (machine-remote-eval machine remote-exp)))
diff --git a/gnu/system.scm b/gnu/system.scm
index fcf3310fa3..c284a18379 100644
--- a/gnu/system.scm
+++ b/gnu/system.scm
@@ -5,7 +5,7 @@
 ;;; Copyright © 2016 Chris Marusich <cmmarusich@gmail.com>
 ;;; Copyright © 2017 Mathieu Othacehe <m.othacehe@gmail.com>
 ;;; Copyright © 2019 Meiyo Peng <meiyo.peng@gmail.com>
-;;; Copyright © 2019 Miguel Ángel Arruga Vivas <rosen644835@gmail.com>
+;;; Copyright © 2019, 2020 Miguel Ángel Arruga Vivas <rosen644835@gmail.com>
 ;;; Copyright © 2020 Danny Milosavljevic <dannym@scratchpost.org>
 ;;; Copyright © 2020 Brice Waegeneire <brice@waegenei.re>
 ;;; Copyright © 2020 Florian Pelz <pelzflorian@pelzflorian.de>
@@ -112,6 +112,7 @@
             operating-system-store-file-system
             operating-system-user-mapped-devices
             operating-system-boot-mapped-devices
+            operating-system-bootloader-crypto-devices
             operating-system-activation-script
             operating-system-user-accounts
             operating-system-shepherd-service-names
@@ -147,6 +148,7 @@
             boot-parameters-root-device
             boot-parameters-bootloader-name
             boot-parameters-bootloader-menu-entries
+            boot-parameters-store-crypto-devices
             boot-parameters-store-device
             boot-parameters-store-directory-prefix
             boot-parameters-store-mount-point
@@ -305,6 +307,8 @@ directly by the user."
   (store-device     boot-parameters-store-device)
   (store-mount-point boot-parameters-store-mount-point)
   (store-directory-prefix boot-parameters-store-directory-prefix)
+  (store-crypto-devices boot-parameters-store-crypto-devices
+                        (default '()))
   (locale           boot-parameters-locale)
   (kernel           boot-parameters-kernel)
   (kernel-arguments boot-parameters-kernel-arguments)
@@ -338,6 +342,13 @@ file system labels."
            (if (string-prefix? "/" device)
                device
                (file-system-label device))))))
+  (define uuid-sexp->uuid
+    (match-lambda
+      (('uuid (? symbol? type) (? bytevector? bv))
+       (bytevector->uuid bv type))
+      (x
+       (warning (G_ "unrecognized uuid ~a at '~a'~%") x (port-filename port))
+       #f)))
 
   (match (read port)
     (('boot-parameters ('version 0)
@@ -411,6 +422,23 @@ file system labels."
           ;; No store found, old format.
           #f)))
 
+      (store-crypto-devices
+       (match (assq 'store rest)
+         (('store . store-data)
+          (match (assq 'crypto-devices store-data)
+            (('crypto-devices (devices ...))
+             (map uuid-sexp->uuid devices))
+            (('crypto-devices dev)
+             (warning (G_ "unrecognized crypto-devices ~S at '~a'~%")
+                      dev (port-filename port))
+             '())
+            (_
+             ;; No crypto-devices found.
+             '())))
+         (_
+          ;; No store found, old format.
+          '())))
+
       (store-mount-point
        (match (assq 'store rest)
          (('store ('device _) ('mount-point mount-point) _ ...)
@@ -525,6 +553,26 @@ from the initrd."
                (any file-system-needed-for-boot? users)))
            devices)))
 
+(define (operating-system-bootloader-crypto-devices os)
+  "Return the subset of mapped devices that the bootloader must open.
+Only devices specified by uuid are supported."
+  (define (valid-crypto-device? dev)
+    (or (uuid? dev)
+        (begin
+          (warning (G_ "\
+mapped-device '~a' may not be mounted by the bootloader.~%")
+                   dev)
+          #f)))
+  (filter-map (match-lambda
+                ((and (= mapped-device-type type)
+                      (= mapped-device-source source))
+                 (and (eq? luks-device-mapping type)
+                      (valid-crypto-device? source)
+                      source))
+                (_ #f))
+              ;; XXX: Ordering is important, we trust the returned one.
+              (operating-system-boot-mapped-devices os)))
+
 (define (device-mapping-services os)
   "Return the list of device-mapping services for OS as a list."
   (map device-mapping-service
@@ -1261,6 +1309,7 @@ a list of <menu-entry>, to populate the \"old entries\" menu."
          (root-fs         (operating-system-root-file-system os))
          (root-device     (file-system-device root-fs))
          (locale          (operating-system-locale os))
+         (crypto-devices  (operating-system-bootloader-crypto-devices os))
          (params          (operating-system-boot-parameters
                            os root-device
                            #:system-kernel-arguments? #t))
@@ -1274,6 +1323,7 @@ a list of <menu-entry>, to populate the \"old entries\" menu."
     (generate-config-file bootloader-conf (list entry)
                           #:old-entries old-entries
                           #:locale locale
+                          #:store-crypto-devices crypto-devices
                           #:store-directory-prefix
 			  (btrfs-store-subvolume-file-name file-systems))))
 
@@ -1313,6 +1363,7 @@ such as '--root' and '--load' to <boot-parameters>."
                                (operating-system-initrd-file os)))
          (store           (operating-system-store-file-system os))
          (file-systems    (operating-system-file-systems os))
+         (crypto-devices  (operating-system-bootloader-crypto-devices os))
          (locale          (operating-system-locale os))
          (bootloader      (bootloader-configuration-bootloader
                            (operating-system-bootloader os)))
@@ -1335,6 +1386,7 @@ such as '--root' and '--load' to <boot-parameters>."
      (locale locale)
      (store-device (ensure-not-/dev (file-system-device store)))
      (store-directory-prefix (btrfs-store-subvolume-file-name file-systems))
+     (store-crypto-devices crypto-devices)
      (store-mount-point (file-system-mount-point store)))))
 
 (define (device->sexp device)
@@ -1393,7 +1445,10 @@ being stored into the \"parameters\" file)."
                       (mount-point #$(boot-parameters-store-mount-point
                                       params))
                       (directory-prefix
-                       #$(boot-parameters-store-directory-prefix params))))
+                       #$(boot-parameters-store-directory-prefix params))
+                      (crypto-devices
+                       #$(map device->sexp
+                              (boot-parameters-store-crypto-devices params)))))
                   #:set-load-path? #f)))
 
 (define-gexp-compiler (operating-system-compiler (os <operating-system>)
diff --git a/gnu/tests/install.scm b/gnu/tests/install.scm
index 71caa3a493..bf94e97c2a 100644
--- a/gnu/tests/install.scm
+++ b/gnu/tests/install.scm
@@ -63,6 +63,7 @@
             %test-separate-home-os
             %test-raid-root-os
             %test-encrypted-root-os
+            %test-encrypted-root-not-boot-os
             %test-btrfs-root-os
             %test-btrfs-root-on-subvolume-os
             %test-jfs-root-os
@@ -885,6 +886,107 @@ reboot\n")
 
 
 ;;;
+;;; LUKS-encrypted root file system and /boot in a non-encrypted partition.
+;;;
+
+(define-os-with-source (%encrypted-root-not-boot-os
+                        %encrypted-root-not-boot-os-source)
+  ;; The OS we want to install.
+  (use-modules (gnu) (gnu tests) (srfi srfi-1))
+
+  (operating-system
+    (host-name "bootroot")
+    (timezone "Europe/Madrid")
+    (locale "en_US.UTF-8")
+
+    (bootloader (bootloader-configuration
+                 (bootloader grub-bootloader)
+                 (target "/dev/vdb")))
+
+    (mapped-devices (list (mapped-device
+                           (source
+                            (uuid "12345678-1234-1234-1234-123456789abc"))
+                           (target "root")
+                           (type luks-device-mapping))))
+    (file-systems (cons* (file-system
+                           (device (file-system-label "my-boot"))
+                           (mount-point "/boot")
+                           (type "ext4"))
+                         (file-system
+                           (device "/dev/mapper/root")
+                           (mount-point "/")
+                           (type "ext4"))
+                         %base-file-systems))
+    (users (cons (user-account
+                  (name "alice")
+                  (group "users")
+                  (supplementary-groups '("wheel" "audio" "video")))
+                 %base-user-accounts))
+    (services (cons (service marionette-service-type
+                             (marionette-configuration
+                              (imported-modules '((gnu services herd)
+                                                  (guix combinators)))))
+                    %base-services))))
+
+(define %encrypted-root-not-boot-installation-script
+  ;; Shell script for an installation with boot not encrypted but root
+  ;; encrypted.
+  (format #f "\
+. /etc/profile
+set -e -x
+guix --version
+
+export GUIX_BUILD_OPTIONS=--no-grafts
+ls -l /run/current-system/gc-roots
+parted --script /dev/vdb mklabel gpt \\
+  mkpart primary ext2 1M 3M \\
+  mkpart primary ext2 3M 50M \\
+  mkpart primary ext2 50M 1.6G \\
+  set 1 boot on \\
+  set 1 bios_grub on
+echo -n \"~a\" | cryptsetup luksFormat --uuid=\"~a\" -q /dev/vdb3 -
+echo -n \"~a\" | cryptsetup open --type luks --key-file - /dev/vdb3 root
+mkfs.ext4 -L my-root /dev/mapper/root
+mkfs.ext4 -L my-boot /dev/vdb2
+mount LABEL=my-root /mnt
+mkdir /mnt/boot
+mount LABEL=my-boot /mnt/boot
+echo \"Checking mounts\"
+mount
+herd start cow-store /mnt
+mkdir /mnt/etc
+cp /etc/target-config.scm /mnt/etc/config.scm
+guix system build /mnt/etc/config.scm
+guix system init /mnt/etc/config.scm /mnt --no-substitutes
+sync
+echo \"Debugging info\"
+blkid
+cat /mnt/boot/grub/grub.cfg
+reboot\n"
+          %luks-passphrase "12345678-1234-1234-1234-123456789abc"
+          %luks-passphrase))
+
+(define %test-encrypted-root-not-boot-os
+  (system-test
+   (name "encrypted-root-not-boot-os")
+   (description
+    "Test the manual installation on an OS with / in an encrypted partition
+but /boot on a different, non-encrypted partition.  This test is expensive in
+terms of CPU and storage usage since we need to build (current-guix) and then
+store a couple of full system images.")
+   (value
+    (mlet* %store-monad
+        ((image (run-install %encrypted-root-not-boot-os
+                             %encrypted-root-not-boot-os-source
+                             #:script
+                             %encrypted-root-not-boot-installation-script))
+         (command (qemu-command/writable-image image)))
+      (run-basic-test %encrypted-root-not-boot-os command
+                      "encrypted-root-not-boot-os"
+                      #:initialization enter-luks-passphrase)))))
+
+
+;;;
 ;;; Btrfs root file system.
 ;;;